diff --git a/docs/conf.py b/docs/conf.py
index 531031913de..82cbe7689cc 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -140,6 +140,8 @@ linkcheck_ignore = [
     r'https://gitlab.freedesktop.org/.*#.*',  # needs JS eval
     r'https://github.com/.*#.*',  # needs JS eval
     r'https://www.intel.com/.*',  # intel.com is blocking the linkcheck user-agent; maybe it can be customized to look like a browser?
+    r'https://sourceforge.net/.*',  # blocking the linkcheck user-agent
+    r'https://stackoverflow.com/.*',  # blocking the linkcheck user-agent
     r'https://cgit.freedesktop.org/.*',  # cgit is no more
 ]
 linkcheck_exclude_documents = [r'relnotes/.*']